Vermont environmental officials are reassessing their fight against PFAS following a report from the EPA last week showing smaller amounts of the so-called forever chemicals are more harmful than previously thought. State leaders say the new EPA standard lowers the PFAS threshold from 70 parts per trillion to four parts per quadrillion. That amount is smaller than most labs even have the technology to identify. PFAS chemicals are in countless consumer products manufactured since the 1950s. They’re in firefighting foam, food packaging, Teflon and ski wax. They’ve been linked to cancer, low birth weights, and other medical problems. The chemicals first came to the attention of state officials around 2016 after they were found in groundwater in Bennington that was traced to the former ChemFab plant. Vermont already has some of the strictest regulations on PFAS and the state is gradually phasing out products that have them. Officials want to hold businesses accountable before more of the chemicals can make it into the environment.